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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* source.c - routines dealing with illumination sources. |
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* |
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* 8/20/85 |
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* External symbols declared in source.h |
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*/ |
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#include "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "rtotypes.h" |
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#include "source.h" |
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|
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#include "random.h" |
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|
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extern double ssampdist; /* scatter sampling distance */ |
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static CNTPTR *cntord; /* source ordering in direct() */ |
40 |
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static int maxcntr = 0; /* size of contribution arrays */ |
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|
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static int cntcmp(const void *p1, const void *p2); |
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|
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marksources() /* find and mark source objects */ |
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|
45 |
> |
extern OBJREC * /* find an object's actual material */ |
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findmaterial(register OBJREC *o) |
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{ |
48 |
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while (!ismaterial(o->otype)) { |
49 |
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if (ismixture(o->otype)) |
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return(NULL); /* reject mixed materials */ |
51 |
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if (o->otype == MOD_ALIAS && o->oargs.nsargs) { |
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OBJECT aobj; |
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OBJREC *ao; |
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aobj = lastmod(objndx(o), o->oargs.sarg[0]); |
55 |
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if (aobj < 0) |
56 |
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objerror(o, USER, "bad reference"); |
57 |
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ao = objptr(aobj); |
58 |
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if (ismaterial(ao->otype)) |
59 |
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return(ao); |
60 |
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} |
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if (o->omod == OVOID) |
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return(NULL); |
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o = objptr(o->omod); |
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} |
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return(o); |
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} |
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|
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|
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extern void |
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marksources(void) /* find and mark source objects */ |
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{ |
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int foundsource = 0; |
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int i; |
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register OBJREC *o, *m; |
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/* initialize dispatch table */ |
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initstypes(); |
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/* find direct sources */ |
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for (i = 0; i < nobjects; i++) { |
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for (i = 0; i < nsceneobjs; i++) { |
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|
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o = objptr(i); |
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|
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
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|
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m = objptr(o->omod); |
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|
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if (!islight(m->otype)) |
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continue; |
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/* find material */ |
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m = findmaterial(objptr(o->omod)); |
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if (m == NULL || !islight(m->otype)) |
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continue; /* not source modifier */ |
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|
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
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m->otype == MAT_SPOT ? 7 : 3)) |
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source[ns].sflags |= SSKIP; |
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} |
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} |
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#if SHADCACHE |
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initobscache(ns); |
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#endif |
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if (!(source[ns].sflags & SSKIP)) |
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foundsource++; |
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} |
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maxcntr = nsources + MAXSPART; /* start with this many */ |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
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if (srccnt == NULL | cntord == NULL) |
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if ((srccnt == NULL) | (cntord == NULL)) |
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goto memerr; |
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return; |
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memerr: |
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} |
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|
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|
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srcray(sr, r, si) /* send a ray to a source, return domega */ |
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register RAY *sr; /* returned source ray */ |
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RAY *r; /* ray which hit object */ |
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SRCINDEX *si; /* source sample index */ |
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extern void |
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freesources(void) /* free all source structures */ |
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{ |
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if (nsources > 0) { |
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#if SHADCACHE |
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while (nsources--) |
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freeobscache(&source[nsources]); |
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#endif |
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free((void *)source); |
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source = NULL; |
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nsources = 0; |
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} |
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if (maxcntr <= 0) |
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return; |
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free((void *)srccnt); |
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srccnt = NULL; |
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free((void *)cntord); |
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cntord = NULL; |
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maxcntr = 0; |
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} |
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|
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|
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extern int |
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srcray( /* send a ray to a source, return domega */ |
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register RAY *sr, /* returned source ray */ |
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RAY *r, /* ray which hit object */ |
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SRCINDEX *si /* source sample index */ |
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) |
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{ |
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double d; /* distance to source */ |
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register SRCREC *srcp; |
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|
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} |
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|
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srcvalue(r) /* punch ray to source and compute value */ |
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register RAY *r; |
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extern void |
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srcvalue( /* punch ray to source and compute value */ |
213 |
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register RAY *r |
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) |
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{ |
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register SRCREC *sp; |
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|
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} |
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sourcehit(r) /* check to see if ray hit distant source */ |
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register RAY *r; |
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static int |
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transillum( /* check if material is transparent illum */ |
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OBJECT obj |
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) |
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{ |
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OBJREC *m = findmaterial(objptr(obj)); |
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|
260 |
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if (m == NULL) |
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return(1); |
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if (m->otype != MAT_ILLUM) |
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return(0); |
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return(!m->oargs.nsargs || !strcmp(m->oargs.sarg[0], VOIDID)); |
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} |
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|
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|
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extern int |
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sourcehit( /* check to see if ray hit distant source */ |
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register RAY *r |
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) |
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{ |
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int glowsrc = -1; |
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int transrc = -1; |
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int first, last; |
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register int i; |
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|
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} else { /* otherwise check all */ |
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first = 0; last = nsources-1; |
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} |
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for (i = first; i <= last; i++) |
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if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
285 |
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/* |
286 |
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* Check to see if ray is within |
287 |
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* solid angle of source. |
288 |
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*/ |
289 |
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if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
290 |
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<= source[i].ss2) { |
291 |
< |
r->ro = source[i].so; |
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if (!(source[i].sflags & SSKIP)) |
293 |
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break; |
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} |
295 |
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|
296 |
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if (r->ro != NULL) { |
297 |
< |
r->robj = objndx(r->ro); |
298 |
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for (i = 0; i < 3; i++) |
299 |
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r->ron[i] = -r->rdir[i]; |
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< |
r->rod = 1.0; |
301 |
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r->rox = NULL; |
302 |
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return(1); |
283 |
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for (i = first; i <= last; i++) { |
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if ((source[i].sflags & (SDISTANT|SVIRTUAL)) != SDISTANT) |
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continue; |
286 |
> |
/* |
287 |
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* Check to see if ray is within |
288 |
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* solid angle of source. |
289 |
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*/ |
290 |
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if (2.*PI*(1. - DOT(source[i].sloc,r->rdir)) > source[i].ss2) |
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continue; |
292 |
> |
/* is it the only possibility? */ |
293 |
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if (first == last) { |
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r->ro = source[i].so; |
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break; |
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} |
297 |
> |
/* |
298 |
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* If it's a glow or transparent illum, just remember it. |
299 |
> |
*/ |
300 |
> |
if (source[i].sflags & SSKIP) { |
301 |
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glowsrc = i; |
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continue; |
303 |
> |
} |
304 |
> |
if (transillum(source[i].so->omod)) { |
305 |
> |
transrc = i; |
306 |
> |
continue; |
307 |
> |
} |
308 |
> |
r->ro = source[i].so; /* otherwise, use first hit */ |
309 |
> |
break; |
310 |
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} |
311 |
< |
return(0); |
311 |
> |
/* |
312 |
> |
* Do we need fallback? |
313 |
> |
*/ |
314 |
> |
if (r->ro == NULL) { |
315 |
> |
if (transrc >= 0 && r->crtype & (AMBIENT|SPECULAR)) |
316 |
> |
return(0); /* avoid overcounting */ |
317 |
> |
if (glowsrc >= 0) |
318 |
> |
r->ro = source[glowsrc].so; |
319 |
> |
else |
320 |
> |
return(0); /* nothing usable */ |
321 |
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} |
322 |
> |
/* |
323 |
> |
* Make assignments. |
324 |
> |
*/ |
325 |
> |
r->robj = objndx(r->ro); |
326 |
> |
for (i = 0; i < 3; i++) |
327 |
> |
r->ron[i] = -r->rdir[i]; |
328 |
> |
r->rod = 1.0; |
329 |
> |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
330 |
> |
r->uv[0] = r->uv[1] = 0.0; |
331 |
> |
r->rox = NULL; |
332 |
> |
return(1); |
333 |
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} |
334 |
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|
335 |
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|
336 |
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static int |
337 |
< |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
338 |
< |
register CNTPTR *sc1, *sc2; |
337 |
> |
cntcmp( /* contribution compare (descending) */ |
338 |
> |
const void *p1, |
339 |
> |
const void *p2 |
340 |
> |
) |
341 |
|
{ |
342 |
+ |
register const CNTPTR *sc1 = (const CNTPTR *)p1; |
343 |
+ |
register const CNTPTR *sc2 = (const CNTPTR *)p2; |
344 |
+ |
|
345 |
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if (sc1->brt > sc2->brt) |
346 |
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return(-1); |
347 |
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if (sc1->brt < sc2->brt) |
350 |
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} |
351 |
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|
352 |
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|
353 |
< |
direct(r, f, p) /* add direct component */ |
354 |
< |
RAY *r; /* ray that hit surface */ |
355 |
< |
int (*f)(); /* direct component coefficient function */ |
356 |
< |
char *p; /* data for f */ |
353 |
> |
extern void |
354 |
> |
direct( /* add direct component */ |
355 |
> |
RAY *r, /* ray that hit surface */ |
356 |
> |
srcdirf_t *f, /* direct component coefficient function */ |
357 |
> |
void *p /* data for f */ |
358 |
> |
) |
359 |
|
{ |
258 |
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extern int (*trace)(); |
360 |
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register int sn; |
361 |
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register CONTRIB *scp; |
362 |
|
SRCINDEX si; |
372 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
373 |
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if (sn >= maxcntr) { |
374 |
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maxcntr = sn + MAXSPART; |
375 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
375 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
376 |
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maxcntr*sizeof(CONTRIB)); |
377 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
377 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
378 |
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maxcntr*sizeof(CNTPTR)); |
379 |
< |
if (srccnt == NULL | cntord == NULL) |
379 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
380 |
|
error(SYSTEM, "out of memory in direct"); |
381 |
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} |
382 |
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cntord[sn].sndx = sn; |
387 |
|
cntord[sn].brt = bright(scp->coef); |
388 |
|
if (cntord[sn].brt <= 0.0) |
389 |
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continue; |
390 |
+ |
#if SHADCACHE |
391 |
+ |
/* check shadow cache */ |
392 |
+ |
if (si.np == 1 && srcblocked(&sr)) { |
393 |
+ |
cntord[sn].brt = 0.0; |
394 |
+ |
continue; |
395 |
+ |
} |
396 |
+ |
#endif |
397 |
|
VCOPY(scp->dir, sr.rdir); |
398 |
|
/* compute potential */ |
399 |
|
sr.revf = srcvalue; |
441 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
442 |
|
VCOPY(sr.rdir, scp->dir); |
443 |
|
sr.rsrc = scp->sno; |
444 |
< |
source[scp->sno].ntests++; /* keep statistics */ |
444 |
> |
/* keep statistics */ |
445 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
446 |
> |
source[scp->sno].ntests >>= 1; |
447 |
> |
source[scp->sno].nhits >>= 1; |
448 |
> |
} |
449 |
|
if (localhit(&sr, &thescene) && |
450 |
|
( sr.ro != source[scp->sno].so || |
451 |
|
source[scp->sno].sflags & SFOLLOW )) { |
454 |
|
rayparticipate(&sr); |
455 |
|
if (trace != NULL) |
456 |
|
(*trace)(&sr); /* trace execution */ |
457 |
< |
if (bright(sr.rcol) <= FTINY) |
457 |
> |
if (bright(sr.rcol) <= FTINY) { |
458 |
> |
#if SHADCACHE |
459 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
460 |
> |
&& (scp >= srccnt+ncnts-1 || |
461 |
> |
scp[1].sno != scp->sno)) |
462 |
> |
srcblocker(&sr); |
463 |
> |
#endif |
464 |
|
continue; /* missed! */ |
465 |
+ |
} |
466 |
|
copycolor(scp->val, sr.rcol); |
467 |
|
multcolor(scp->val, scp->coef); |
468 |
|
} |
494 |
|
} |
495 |
|
|
496 |
|
|
497 |
< |
srcscatter(r) /* compute source scattering into ray */ |
498 |
< |
register RAY *r; |
497 |
> |
extern void |
498 |
> |
srcscatter( /* compute source scattering into ray */ |
499 |
> |
register RAY *r |
500 |
> |
) |
501 |
|
{ |
502 |
|
int oldsampndx; |
503 |
|
int nsamps; |
542 |
|
if (!srcray(&sr, NULL, &si) || |
543 |
|
sr.rsrc != r->slights[i]) |
544 |
|
continue; /* no path */ |
545 |
+ |
#if SHADCACHE |
546 |
+ |
if (srcblocked(&sr)) /* check shadow cache */ |
547 |
+ |
continue; |
548 |
+ |
#endif |
549 |
|
copycolor(sr.cext, r->cext); |
550 |
|
copycolor(sr.albedo, r->albedo); |
551 |
|
sr.gecc = r->gecc; |
552 |
|
sr.slights = r->slights; |
553 |
|
rayvalue(&sr); /* eval. source ray */ |
554 |
< |
if (bright(sr.rcol) <= FTINY) |
554 |
> |
if (bright(sr.rcol) <= FTINY) { |
555 |
> |
#if SHADCACHE |
556 |
> |
srcblocker(&sr); /* add blocker to cache */ |
557 |
> |
#endif |
558 |
|
continue; |
559 |
+ |
} |
560 |
|
if (r->gecc <= FTINY) /* compute P(theta) */ |
561 |
|
d = 1.; |
562 |
|
else { |
593 |
|
* geometry behind (or inside) an effective radiator. |
594 |
|
*/ |
595 |
|
|
596 |
< |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
597 |
< |
{register OBJREC *o = objptr(obj); |
598 |
< |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
596 |
> |
static int |
597 |
> |
weaksrcmat(OBJECT obj) /* identify material */ |
598 |
> |
{ |
599 |
> |
OBJREC *m = findmaterial(objptr(obj)); |
600 |
> |
|
601 |
> |
if (m == NULL) return(0); |
602 |
> |
return((m->otype==MAT_ILLUM) | (m->otype==MAT_GLOW)); |
603 |
> |
} |
604 |
|
|
605 |
|
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
606 |
|
r->rod > 0.0 && \ |
607 |
< |
weaksrcmod(source[r->rsrc].so->omod)) |
607 |
> |
weaksrcmat(source[r->rsrc].so->omod)) |
608 |
|
|
609 |
|
/* wrongsource * |
610 |
|
* |
660 |
|
distglow(m, r, raydist(r,PRIMARY))) |
661 |
|
|
662 |
|
|
663 |
< |
m_light(m, r) /* ray hit a light source */ |
664 |
< |
register OBJREC *m; |
665 |
< |
register RAY *r; |
663 |
> |
extern int |
664 |
> |
m_light( /* ray hit a light source */ |
665 |
> |
register OBJREC *m, |
666 |
> |
register RAY *r |
667 |
> |
) |
668 |
|
{ |
669 |
|
/* check for over-counting */ |
670 |
|
if (badcomponent(m, r)) |